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50a high coil capacity can easily handle those high current applications. Pin specifications: 30-high power feed, 85-Relay coil ground, 86-relay coil feedtrigger wire, 87-high power outputnormally open contact). Application: widely used to install electric cooling fans, Electric water Pumps, Shaved door handles solenoids, automotive setups, Electric fuel pumps, Trunk solenoids, car sound systems, Horns, security systems, and various other applications.





85 and 86 are the relay coil ends, 30 and 87 are the normally open contact terminals of the relay, 30 and 87 will be connected. When the positive is connected to the power, the light will be on; when the positive is not connected to the power, when 85 and 86 connect the power, the indicator light will be off.

Easy assembly: each relay is equipped with a pre-wired socket for easy wiring; Interlocking design relay socket harness base for easy cable management & organization.


1. Gebildet
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Gebildet JD1912 Car Relay Harness 12V 40A 4 Pin SPST Harness Sockets with Color-Labeled Wires for Automotive Truck Van Motorcycle Boat Pack of 2
#adGebildet #ad - Minimum operating voltage 8v, corresponding minimum operating current is 100mA; Standard operating voltage 12V, corresponding standard operating current is 150mA. Contact material: ag alloy / Contact Resistance: ≤ 100MΩ.More information #ad
Brand new heavy duty sPSTSingle Pole Single Throw relays with color-labeled wires. Small size/low power consumption/High contact voltage/ High sensitivity. Life expectancy electrical: 100, life Expectancy Mechanical: 10, 000, 000 Operation, 000 Operation.Brand | Gebildet #ad |
Manufacturer | Gebildet #ad |
Part Number | E079 |
Model | E079 |
More information #ad
2. EPLZON
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EPLZON JD1912 Relay 4 Pin 40A 12V SPST Car Truck Van Motorcycle Boat Relay Pack of 2 pcs
#adEPLZON #ad - Contact rating: no: dc 12v 40a, nc : DC 12V 30A. Function: this relay will eliminate a high voltage drop in the wire, so it allows your components to work properly.50a high coil capacity can easily handle those high current applications. Pin specifications: 30-high power feed, 85-Relay coil ground, 86-relay coil feedtrigger wire, 87-high power outputnormally open contact). Application: widely used to install electric cooling fans, Electric water Pumps, Shaved door handles solenoids, automotive setups, Electric fuel pumps, Trunk solenoids, car sound systems, Horns, security systems, and various other applications.
More information #ad
Product name:jd1912 automotive dc 4 pin 12v 40a sPST electrical relay Relay, high quality copper coils and silver contacts create excellent electrical conductivity.Brand | EPLZON #ad |
Manufacturer | EPLZON #ad |
Part Number | EP-JD-1912 |
More information #ad
3. BLARYETI
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BLARYETI JD1912 Automotive Relay 4-Pin 40A 12V SPST Car Truck Van Motorcycle Boat Relay,1 Pack
#adBLARYETI #ad - 4-pin spst single pole Single Throw Relay. Contact rating: no: dc 12v 40a, nc : DC 12V 30A. Hight switching Capability: Max 40A. High quality,mechanical life of 10, 000+ cycles. Use optional relay Harness, or female Crimp Connectors.More information #ad
Brand | BLARYETI #ad |
Manufacturer | BLARYETI #ad |
Height | 0.39 Inches |
Length | 3.94 Inches |
Width | 1.97 Inches |
Part Number | relay-C1 |
More information #ad
4. BLARYETI
#ad
JD1912 Automotive Relay 4-Pin 40A 12V SPST Car Truck Van Motorcycle Boat Relay,5 Pack
#adBLARYETI #ad - Contact rating: no: dc 12v 40a, nc : DC 12V 30A. Use optional relay Harness, or female Crimp Connectors. 4-pin spst single pole Single Throw Relay. Hight switching Capability: Max 40A. High quality,mechanical life of 10, 000+ cycles.More information #ad
Brand | BLARYETI #ad |
Manufacturer | BLARYETI #ad |
Part Number | relay-B5 |
Model | relay-B5 |
More information #ad
5. XtremeAmazing
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XtremeAmazing Pack of 2 Car Relay Socket Harness JD1912 12V 40A 4 Pin SPST Wires for Automotive Truck Van Motorcycle Boat Switches Starters Set
#adXtremeAmazing #ad - Contact resistance: ≤ 100MΩ. Relay load: 40A/12VDC. Package contents: 2 x 40a 4-pin 12V Vehicle Relay, 2 x Pre-wired socket. 40amp connector Socket with 4 Terminals design.More information #ad
Brand | XtremeAmazing #ad |
Manufacturer | XtremeAmazing #ad |
Part Number | JD1912 |
Model | JD1912 |
More information #ad
6. HiSport
#ad
Car Relay JD1912 12V 40A 4 Pin SPST for Motorcycle Boat Automotive Truck Van 1 Pack, HiSport
#adHiSport #ad - Contact rating: no: dc 12v 40a, nc : DC 12V 30A. Function: this relay will eliminate a high voltage drop in the wire, so it allows your components to work properly. 50a high coil capacity can easily handle those high current applications.More information #ad
Application: widely used to install electric cooling fans, Electric water Pumps, Shaved door handles solenoids, Trunk solenoids, security systems, automotive setups, car sound systems, Horns, Electric fuel pumps, and various other applications. High-quality electrical Relay Relay: Copper coils and silver contacts create excellent electrical conductivity.Brand | HiSport #ad |
Manufacturer | HiSport #ad |
Part Number | HSPELJD1912 |
More information #ad
7. uxcell
#ad
Uxcell JD-1912 4 Pin DC 12V 40A Universal Car Vehicle Motor Fuse Relay Switch Power with Harness
#aduxcell #ad - It is recommended to confirm the model, appearance, and function before placing an order. Pin number: 4; current: 40A; Voltage: DC 12V.85 and 86 are the relay coil ends, 30 and 87 are the normally open contact terminals of the relay, 30 and 87 will be connected. When the positive is connected to the power, the light will be on; when the positive is not connected to the power, when 85 and 86 connect the power, the indicator light will be off.
More information #ad
Made of metal and plastic, durable materials for long time service. Make sure this is the correct relay replacement your car need before purchase. Suitable for cars and motorcycles.Brand | uxcell #ad |
Manufacturer | uxcell #ad |
Part Number | a19031900ux0053 |
More information #ad
8. DIANQI
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DIANQI 14VDC 40Amp Automotive Relay with Interlocking Socket and Copper Wiring Harness for Car Truck Marine Boat Horn Relay 1-Pack 4-pin 12VDC
#adDIANQI #ad - Product name: 40a 4-pin 12VDC Automotive relay with socket and harness. Application: widely used in horns, lamps, fuel pumps, cooling fans, sound systems, water pumps, security systems, and various other applications.Easy assembly: each relay is equipped with a pre-wired socket for easy wiring; Interlocking design relay socket harness base for easy cable management & organization.
More information #ad
Flameresistant shell: the shell of relay is made of flameresistant material so the working temperature is -40 to+85℃; The shell is also smooth and durable. High quality: all copper coil is more sensitive and stable; Silver alloy contact makes the relay more conductive and durable; The wires are made of pure copper with thick cover for long and save use.Brand | DIANQI #ad |
Manufacturer | DIANQI #ad |
Part Number | QC-JDQ-12V-5Pins-DaiCha |
More information #ad
9. EHDIS
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Auto Switches & Starters,Pack of 2, EHDIS Car Relay 4 Pin 12v 40amp Spst Model No.: JD2912-1H-12VDC 40A 14VDC
#adEHDIS #ad - High 40a coil capacity- able to handle those high current applications with ease. Use optional relay Harness, or female Crimp Connectors.More information #ad
Package include: 2 x 40a 4-Pin 12V Vehicle Relays. Important note: ehdis is the original Brand of this relay, We only guarantee the quality of Ehdis store products. Heavy duty 4-prongs SPST relays.Brand | EHDIS #ad |
Manufacturer | Ehdis #ad |
Height | 0.98 Inches |
Length | 1.06 Inches |
Weight | 0.09 Pounds |
Width | 1.06 Inches |
Part Number | 2C05-12V |
Model | 2C05-12V |
More information #ad
10. Openlot
#ad
Tractor Truck Boat Auto Switches & Starters, Car Relay 12V 4 Pin 40amp Spdt Model JD2912-1H-12VDC 40A 14VDC, 2 Pack
#adOpenlot #ad - Mechanical life of 10, 000+ cycles, large Capacity, 40a split charge relay, Ideal for any 12V Applicatio. This kit can be used to install electric cooling fans, Electric water Pumps, Electric fuel pumps, Shaved door handles solenoids, Trunk solenoids, Horns.More information #ad
These are heavy duty 40a relays. Using this kit will eliminate a high voltage drop in the wire, so it allows your components to work properly. Package included: 2pcs car relay 4 pin 12v 40amp model No : JD2912-1H-12VDC 40A 14VDC. Heavy duty Make or Breakon/off Relay. 4 pin high quality durable Terminal.Brand | Openlot #ad |
Manufacturer | Openlot #ad |
Part Number | JD2912-1H-12VDC |
Model | 799899837872 |
More information #ad